Enabling resolution of isomeric peptides using tri-state ion gating and Fourier-transform ion mobility spectrometry

Just published in International Journal for Ion Mobility Spectrometry,  we compare the ability of the tri-state ion shutter (3S-IS) to the two-state ion shutter (2S-IS) in separating three pairs of isomeric peptide including 1.Gly-Arg-Gly-Asp-Ser (GRGDS) / Ser-Asp-Gly-Arg-Gly (SDGRG); 2.Sar-Arg-Gly-Asp-Ser-Pro (SRGDSP) / Gly-Arg-Gly-Asp-Thr-Pro (GRGTP); 3.Kemptide / (Val⁶, Ala⁷)-Kemptide using electrospray ionization and FT-IMS.